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compiler_bugs.cmake
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# Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is also distributed with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have included with MySQL.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License, version 2.0, for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
INCLUDE(CheckCSourceRuns)
INCLUDE(CheckCXXSourceRuns)
FUNCTION(CHECK_C_COMPILER_BUG NO_BUG_VAR BAD_FLAGS WORKAROUND_FLAGS CODE)
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${BAD_FLAGS}")
CHECK_C_SOURCE_RUNS("${CODE}" ${NO_BUG_VAR})
IF(NOT ${NO_BUG_VAR})
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${WORKAROUND_FLAGS}")
CHECK_C_SOURCE_RUNS("${CODE}" ${NO_BUG_VAR}_WORKAROUND)
IF(NOT ${NO_BUG_VAR}_WORKAROUND AND NOT FORCE_UNSUPPORTED_COMPILER)
MESSAGE(FATAL_ERROR
"${NO_BUG_VAR} failed and workaround '${WORKAROUND_FLAGS}' not working!")
ENDIF()
IF(NOT ${NO_BUG_VAR}_WORKAROUND)
MESSAGE(WARNING
"${NO_BUG_VAR} failed and workaround '${WORKAROUND_FLAGS}' not working!")
ELSE()
MESSAGE(STATUS "Workaround for ${NO_BUG_VAR} added: ${WORKAROUND_FLAGS}")
SET(COMMON_C_WORKAROUND_FLAGS
"${COMMON_C_WORKAROUND_FLAGS} ${WORKAROUND_FLAGS}" PARENT_SCOPE)
ENDIF()
ENDIF()
ENDFUNCTION()
FUNCTION(CHECK_CXX_COMPILER_BUG NO_BUG_VAR BAD_FLAGS WORKAROUND_FLAGS CODE)
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${BAD_FLAGS}")
CHECK_CXX_SOURCE_RUNS("${CODE}" ${NO_BUG_VAR})
IF(NOT ${NO_BUG_VAR})
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${WORKAROUND_FLAGS}")
CHECK_CXX_SOURCE_RUNS("${CODE}" ${NO_BUG_VAR}_WORKAROUND)
IF(NOT ${NO_BUG_VAR}_WORKAROUND AND NOT FORCE_UNSUPPORTED_COMPILER)
MESSAGE(FATAL_ERROR
"${NO_BUG_VAR} failed and workaround '${WORKAROUND_FLAGS}' not working!")
ENDIF()
IF(NOT ${NO_BUG_VAR}_WORKAROUND)
MESSAGE(WARNING
"${NO_BUG_VAR} failed and workaround '${WORKAROUND_FLAGS}' not working!")
ELSE()
MESSAGE(STATUS "Workaround for ${NO_BUG_VAR} added: ${WORKAROUND_FLAGS}")
SET(COMMON_CXX_WORKAROUND_FLAGS
"${COMMON_CXX_WORKAROUND_FLAGS} ${WORKAROUND_FLAGS}" PARENT_SCOPE)
ENDIF()
ENDIF()
ENDFUNCTION()
# Below code is known to fail for GCC 5.3.0 on sparc solaris 11.
SET(code "
inline void g(unsigned size, unsigned x[], unsigned y[])
{
unsigned i;
for (i = 0; i < size; i++)
{
x[i] |= y[i];
}
for (i = 0; i < size; i++)
{
y[i] = 0;
}
}
struct A
{
long a; // Make struct A 8 byte aligned
int b; // Make x[] not 8 byte aligned
unsigned x[6];
unsigned y[6];
};
void f(struct A* a)
{
g(6, a->x, a->y);
}
int
main()
{
struct A a;
f(&a);
return 0;
}
")
IF(CMAKE_COMPILER_IS_GNUCC)
CHECK_C_COMPILER_BUG(HAVE_NOT_C_BUG_LOOP_VECTORIZE
"-O3 -fPIC"
"-fvect-cost-model=cheap -fno-tree-loop-distribute-patterns -fno-tree-loop-vectorize"
"${code}")
ENDIF()
IF(CMAKE_COMPILER_IS_GNUCXX)
CHECK_CXX_COMPILER_BUG(HAVE_NOT_CXX_BUG_LOOP_VECTORIZE
"-O3 -fPIC"
"-fvect-cost-model=cheap -fno-tree-loop-distribute-patterns -fno-tree-loop-vectorize"
"${code}")
ENDIF()
# Below code is known to fail for GCC 5.3.0 on sparc solaris 11.
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67781
SET(code "
struct X
{
int i;
unsigned short s;
};
unsigned __attribute__((noinline)) f(struct X x)
{
return x.s | (x.i << 16);
}
int
main()
{
struct X x;
x.i = 0x00001234;
x.s = 0x5678;
unsigned y = f(x);
return y == 0x12345678 ? 0 : 1;
}
")
IF(CMAKE_COMPILER_IS_GNUCC)
CHECK_C_COMPILER_BUG(HAVE_NOT_C_SHIFT_OR_OPTIMIZATION_BUG
"-O3 -fexpensive-optimizations"
"-fno-expensive-optimizations"
"${code}")
ENDIF()
IF(CMAKE_COMPILER_IS_GNUCXX)
CHECK_CXX_COMPILER_BUG(HAVE_NOT_CXX_SHIFT_OR_OPTIMIZATION_BUG
"-O3 -fexpensive-optimizations"
"-fno-expensive-optimizations"
"${code}")
ENDIF()